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Prevalence of Parasitic Contamination of Raw Vegetables in Nakhon Si

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Prevalence of Parasitic Contamination of Raw Vegetables in Nakhon Si Punsawad et al. BMC Public Health (2019) 19:34 https://doi.org/10.1186/s12889-018-6358-9 RESEARCH ARTICLE Open Access Prevalence of parasitic contamination of raw vegetables in Nakhon Si Thammarat province, southern Thailand Chuchard Punsawad1,3* , Nonthapan Phasuk1,3, Kanjana Thongtup1, Surasak Nagavirochana1 and Parnpen Viriyavejakul2 Abstract Background: Soil-transmitted helminth (STH) infections are major public health problems in poor and developing countries that require fecal contamination of the environment for transmission. The consumption of raw vegetables without proper washing is one of the main routes of intestinal parasite acquisition. Therefore, this study was designed to detect the prevalence of intestinal parasitic contamination in commonly consumed raw vegetables sold in three central open-air markets in Nakhon Si Thammarat province, southern Thailand. Methods: A total of 265 fresh vegetable samples consisting of peppermint, lettuce, coriander, leek, gotu kola, celery, Chinese cabbage, culantro, Thai basil, and Chinese morning glory were purchased from three central open-air markets in the Mueang, Thasala and Sichon districts from December 2016 to March 2017. Each sample was washed with physiological saline, shaken for 15 min, and then allowed to sediment. Finally, sedimentation was performed via the sedimentation concentration technique and examined using light microscopy for the detection of pathogenic parasites. Results: The overall prevalence of parasitic contamination was 35.1% (93/265). The most predominant parasite was hookworms (42.9%), followed by Strongyloides stercoralis (10.6%), Trichuris trichiura (2.6%), Ascaris lumbricoides (2.6%), and Toxocara spp. (2.6%). The highest level of contamination was found in celery, with a prevalence rate of 63.3% (19/30), while the lowest contamination level was found in Chinese morning glory, with a prevalence rate of 2.0% (2/30). The prevalence of intestinal parasite contamination in Mueang district (51.5%) was significantly higher than that in Thasala district (17.9%) and Sichon district (30.6%) (P < 0.001). Conclusion: The results of the present study demonstrate that consumption of vegetables with parasite contamination in this area represents a potential route for the transmission of parasitic infection, particularly hookworm infection. Therefore, it is necessary for health authorities to educate consumers about the proper washing of vegetables prior to consumption. Preventive methods such as wearing gloves and washing hands after handling vegetables should also be advocated to sellers who are at risk of acquiring STH infections via skin penetration. Keywords: Parasitic contamination, Raw vegetables, Intestinal parasites, Thailand * Correspondence: [email protected] 1School of Medicine, Walailak University, 222 Thasala district, Nakhon Si Thammarat 80161, Thailand 3Tropical Medicine Research Unit, Research Institute for Health Sciences, Walailak University, 222 Thasala district, Nakhon Si Thammarat 80161, Thailand Full list of author information is available at the end of the article © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Punsawad et al. BMC Public Health (2019) 19:34 Page 2 of 7 Background 45′6″E longitude. The average annual temperature is Parasitic infections represent a major global public health 28.2 °C, and approximately 1702.6 mm of precipitation problem. The burden of parasitic infections often affects falls annually (Climatological Center, Thai Meteoro- developing countries, which frequently lack good sanitiza- logical Department, Annual report 2015). According to tion and personal hygiene practices. Moreover, environ- official statistic registration systems, the total population mental factors such as climate, geography, temperature, in this area is approximately 1,557,482. Fresh vegetable soil type, and rainfall also play important roles that con- samples were purchased from three central open-air tribute to the prevalence of parasitic infections. markets located in Mueang (the capital district of In southern Thailand, the most prevalent parasitic Nakhon Si Thammarat province), Thasala (approxi- infection among all age groups has been soil-transmitted mately 30 km away from the capital district) and Sichon helminth (STH) infections, especially hookworm infec- districts (approximately 70 km away from the capital dis- tion [1–4], which may transmit to humans through ei- trict) (Fig. 1). The fresh vegetables sold in these markets ther skin penetration or the ingestion of its larvae [5]. were brought from different farms and agricultural areas The consumption of fresh vegetables is a common in different parts of Nakhon Si Thammarat province. eating habit among people in southern Thailand. Fur- ther, healthy food trends in Thailand are now focused on Sample collection sufficient daily vegetable consumption, as this could help A total of 265 fresh vegetable samples including 10 differ- prevent major diseases, such as cardiovascular disease ent types that are frequently consumed without cooking and certain cancers. The WHO also recommended the were randomly purchased from sellers in three central intake of a minimum of 400 g of fruit and vegetables per open-air markets. The fresh raw vegetable samples used in day for micronutrient supplementation as well as the this study included peppermint (Mentha x piperita), let- prevention of the aforementioned chronic diseases [6]. tuce (Lactuca sativa), coriander (Coriandrum sativum), However, eating raw vegetables may also lead to the leek (Allium porrum), gotu kola (Centella asiatica), celery transmission of certain human pathogens (fresh fruits (Apium graveolens), Chinese cabbage (Brassica rapa and vegetables are vectors for the transmission of hu- man pathogens) [7]. Several studies have reported the parasitic contamination of fresh vegetables in many countries around the world, for example, Arba Minch town, southern Ethiopia [8], Khartoum state, Sudan [9], Benha, Egypt [10], Accra, Ghana [4], Mazandaran prov- ince, northern Iran [11], Poland [12], and Metro Manila, Philippines [13]. Parasites and protozoa that were com- mon contaminants included Ascaris lumbricoides, Crypto- sporidium spp., Entamoeba histolytica/dispar, Enterobius vermicularis, Giardia intestinalis,hookworm,Hymenole- pis spp., and Trichuris trichiura [4, 8–12, 14]. These con- taminants could result from water used to moisten vegetables and postharvesting handling methods [8, 9, 15]. Nakhon Si Thammarat province is an endemic area for STH infection [3]. To date, there have been no re- ports on parasitic vegetable contamination in this area. Therefore, the main aim of this study was to determine the prevalence of parasitic contamination in commonly consumed vegetables in Nakhon Si Thammarat prov- ince, southern Thailand. Methods Study area A cross-sectional study was conducted from December 2016 to March 2017 in Nakhon Si Thammarat province, which is located in southern Thailand approximately Fig. 1 Location of the study area including the Mueang (1), Thasala (2) 800 km from Bangkok, the capital of Thailand. This area and Sichon districts (3) of Nakhon Si Thammarat province, southern has a tropical rainforest climate and is located at the Thailand (Map from Wikimedia Commons: https://commons.wikimedia. org/wiki/File:Amphoe_8001.svg) geographical coordinates of 8°43′10″N latitude and 99° Punsawad et al. BMC Public Health (2019) 19:34 Page 3 of 7 subsp. pekinensis), culantro (Eryngium foetidum), Thai rate of parasitic contamination among different types of basil (Ocimum basilicum), and Chinese morning glory vegetable and among different markets. A p-value less (Ipomoea aquatica). The pictures of vegetable samples than 0.05 was considered statistically significant. were demonstrated in Fig. 2. The fresh vegetable samples were collected in clean, labeled plastic bags and trans- Results ported immediately to the parasitology laboratory at the A total of 265 fresh vegetable samples were examined School of Medicine, Walailak University for parasitic for the presence of parasite contamination. The results examination. of parasitic contamination in vegetable samples are shown in Table 1. The parasites detected in vegetable Detection of intestinal parasites samples were hookworm, Strongyloides stercoralis, Tri- Fresh vegetable samples weighing 200 g were washed churis trichiura, Ascaris lumbricoides, and Blastocystis with 1000 mL of physiological saline solution (0.9% so- spp. Pictures of some of the parasites found in this dium chloride) and shaken for 15 min in order to separ- survey were demonstrated in Fig. 3. The overall rate of ate the parasites from vegetables. Then, the washing intestinal parasite detection was 35.1% (93/265) in all water was collected and left overnight to allow sedimen- vegetable samples. The highest rate of contamination tation. Afterward, the supernatant was decanted, and the was found in celery [63.3% (19/30)] while the lowest was remaining washing water
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